Electric-pneumatic thermoscope available as fire indicators and for like purposes



g, 1931. a D5 FILIPPI 1,819,077 ELECTRIC PNEUUTIC THERIOSCOPE AVAILABLE AS FIRE IKDICATORS AND FOR LIKE PURPOSES V Filed lay 17. 1929 BY. fF/Q .Patented Aug. 18, 1931 PATENT OFFICE CARLO DE IILIPPI, OF MILAN, ITALY ELECTRIC-PNEUMATIC THERHOSCOPE AVAILABLE AS FIRE INDICATORS AND FOR LIKE PURPOSES Application filed Kay 17, m9, Serial No. 363,981, and in Italy April 10, 1929.

The present invention relates, to a new kind of electric-pneumatic thermoecope, which is of a. very sensitive operation, aim is in construction and may be easily assemb ed and disassembled, the same being particularly available as a fire indicator and for like purposes.

The thermoscope forming the subject of the present invention is mainly formed by a curved tube containing a certain amount of mercury and prolonged at its ends by two diverging tubular branches endin in two spherical bulbs or the like, filled with air or other suitable gases.

One of the bulbs is completely protected against surrounding heat, while the other is readily affected by the heat, so as to cause, when the external temperature rises, a dilatation of the gases it contains, which displacin themselves through thecorresponding tu ular branch cause a d' lacementof the mercury contained in the ower curved tubular body. The displacement of the mercury closes an electric circuit of an optic or acoustic indicator, the conductors of which are connected with two contacts placed inside the tube.

The main characteristic of the improved thermoscope consists in the fact that said tubular body is placed in a casing formed from complementary half boxes which are clam ed together by means of screws and which are provided at their heads with two divergin members for receiving the bulbs, one of t ese members havin a side wall, while the other has slots therein, which coincides with the slots of the other member when assembled to permit the circulation of air. A tubular body is supported within the casing by stra s, or other suitable means.

The splrit of t e invention will be easily understood with reference to the annexed drawings, showing by way of an exam a one of the possible embodiments of the t ermoscope forming the subject of the present invention.

In the said drawings:

Fig. 1 is a front view of the thermoscope with one of the half boxes of the casing removed.

Fig. 2 is a cross section through the thermoscope.

Fig. 3 is a plan view of the same.

Fig. 4 is an external front view of it.

According to the drawings, 1-- is the curved tube containing the mercury -2-- and prolonged by the tubular branches 3-- and 4-- which end respectively in bulbs 5- and -6- filled with air or other gases; --7- and 8-- are the two half boxes formmg the casing for the tubular body and connected with one another by means of screws -9 and -10- and rovided respectively the one with the re onged arts -7'- 7" and the ot er with t e prolonged parts-8, -8"-, so disposed as to suitably contain when the device is assembled, in the box like body formed by 7'- and -8'- the bulb -5- and in the box like body formed by and the bulb 6--; -1 1- and -12 are slots formed in the wall of the parts -7- and 8' respectively, to permit free access of air to the bulb 5-; 13- and -14 are terminals adapted to be connected with an electric de- V168 for optic or acoustic signals; -15- and -16 are the contacts for the conductors -17- and --18- when connected with the terminals 13 and -14; -19 are straps serving to hold the tubular body in place --20 1s a washer carrying the straps ywhich said body is supported; and 21- is $1 opening of the front wall of the part It is obvious that details of construction and form of the apparatus above described may be varied wit out departing from the spirit of the present invention.

Having now particularly described and ascertained the nature of my said invention and the manner in which t e same is to be performed, I declare that what I claim is A device of the class described compris- 1ng a casin consisting of complementary sections, eac section having divergingly disposed prolongations having box terminals, means carme by the sections to retain the same in detacha ly clam ed relationship, a washer carried by one 0 f the sections and havmg straps carried thereby for disposi- 1 tion within the casin a tube having a looped portion, the arms which terminate in divergingly disposed branches having bulbs upon their ends for engagement in the respective boxes, said straps engaging the branches of the tube to maintain the same centralized in the casing, said loop having contacts associated therewith, mercury in the loop cooperating with the contacts, said bulbs having gas therein for displacin the mercury to close the contact when the bulbs are subjected to abnormal heat, one of said boxes being closed and the other having openings therein, as and for the purpose set forth.

In testimony whereof I afiix my signature.

CARLO DE FILIPPI. 

